CN217718230U - Projection module based on micro-lens array and projection system - Google Patents
Projection module based on micro-lens array and projection system Download PDFInfo
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- CN217718230U CN217718230U CN202221432347.XU CN202221432347U CN217718230U CN 217718230 U CN217718230 U CN 217718230U CN 202221432347 U CN202221432347 U CN 202221432347U CN 217718230 U CN217718230 U CN 217718230U
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Abstract
The utility model discloses a projection module and projection system based on microlens array, including field lens array, projection source, projection lens array, prism array, form the compartment between prism array and the projection lens array, the prism array surface divide into interval part and mirror surface part, interval part and mirror surface part interval arrangement and switch on each other through the compartment, interval part and basement one surface are parallel, mirror surface part and basement one surface form certain contained angle; the prism array is divided into M layers along the light propagation direction, the M layers of prism arrays are made of different materials, contact interfaces of every two adjacent layers of prism arrays form a first interface area and a second interface area which are alternately arranged, the first interface area corresponds to the interval part, and the second interface area corresponds to the mirror surface part; the projection lens array is divided into N layers along the light propagation direction, the N layers of projection lens arrays are made of different materials, and at least one side surface type in two side surface types of each layer of projection lens array is an optical surface type except for a plane.
Description
Technical Field
The utility model relates to an optics projection structure, especially a projection module and contain this projection module's projection system based on microlens array.
Background
A microlens array (MLA) is a set of precision-manufactured microlenses or "microlenses". The array is a custom designed module. Its optical principle is based on a combination of illumination optics and projection optics. Light emitted by the light source is projected onto the field lens array and then converged on a focal plane of the projection lens array. The focal plane is provided with a projection source, the projection source is provided with a plurality of micro shading openings, and light can project light patterns with bright and dark brightness through the openings. Microlens arrays are used in a wide variety of applications, such as vehicle lighting systems, projection displays.
In the prior art, although the micro-lens splicing realizes the large-depth-of-field projection of the pattern and the optical equipment turning light path splicing realizes the large-angle projection of the pattern, the problem of chromatic aberration under the illumination of a composite light source (such as white light) is not solved.
SUMMERY OF THE UTILITY MODEL
Utility model purpose: the utility model aims at providing a projection module, preparation technology and projection system based on microlens array to overcome above-mentioned technical problem.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
a projection module based on a micro-lens array comprises a field lens array, a projection source, a projection lens array and a prism array which are sequentially arranged along the light propagation direction; the prism array is solidified on one side surface of the first substrate, the projection lens array is solidified on one side surface of the second substrate, a spacing area is formed between the prism array and the projection lens array, vacuum or filled gas is filled in the spacing area, the prism array surface is divided into a spacing part and a mirror part, the spacing part and the mirror part are arranged at intervals and are mutually communicated through the spacing area, the spacing part is parallel to the surface of the first substrate, and a certain included angle is formed between the mirror part and the surface of the first substrate;
the prism array is divided into M layers along the light propagation direction, M is a positive integer greater than or equal to 1, when M is greater than 1, the M layers of prism arrays are made of different materials, contact interfaces of every two adjacent layers of prism arrays form a first interface area and a second interface area which are alternately arranged, the first interface area corresponds to a spacing part and is parallel to the surface of the first substrate, and the second interface area corresponds to a mirror part and forms a certain included angle with the surface of the first substrate;
the projection lens array is divided into N layers along the light propagation direction, N is a positive integer greater than or equal to 1, when N is greater than 1, the N layers of projection lens arrays are made of different materials, and at least one side of the two side types of each layer of projection lens array is an optical surface type except for a plane.
Further, the prism array is divided into two or more layers along the light propagation direction.
Furthermore, the projection lens array is divided into a first layer of projection lens array and a second layer of projection lens array along the light propagation direction, one side surface of the first layer of projection lens array, which is in contact with the substrate, is a plane, one side surface of the first layer of projection lens array, which is in contact with the second layer of projection lens array, is an aspheric surface, and one side surface of the second layer of projection lens array, which is in contact with the spacer, is an aspheric surface.
Furthermore, the projection lens array is solidified on one side surface of the second substrate, the projection source is solidified on the other side surface of the second substrate opposite to the projection lens array, and the field lens array is solidified on the projection source.
Furthermore, a support is arranged between the first substrate and the second substrate and used for fixing the first substrate and the second substrate and isolating the interval area from the outside air.
Further, the first substrate is a single-layer glass plate or a multi-layer glass plate bonded together, and the second substrate is a single-layer glass plate.
A projection system comprises a light source and a plurality of projection modules.
Further, optical parameters of the plurality of projection modules are the same or different, and the optical parameters include: the focal length of the field lens array, the focal length of the projection lens array, the distance from the field lens array to the projection lens array, the distance from the projection lens array to the projection source, and the included angle formed by the mirror surface part of the prism array and the surface of the first substrate.
Has the advantages that: the utility model discloses a multilayer projection lens and multilayer prism structure utilize the different dispersion characteristics of different materials and the geometric parameter at different interfaces, have solved the colour difference problem to under the composite light source (like white light) illumination in the projection formation of image. The multilayer projection lens has the function that the focal lengths of different colors of light rays are the same or the difference is small, so that projection patterns at different distances do not show chromatic aberration under the irradiation of a composite light source (such as white light); the multilayer prism array has the function that the deflection angles of the light rays with different colors are the same or the difference is small, so that the projection patterns with different angles do not show chromatic aberration under the irradiation of a composite light source (such as white light);
the micro-lens array of the projection module is solidified and molded by impressing glue, wherein the surface of the prism array is divided into the spacing part and the mirror part, the spacing part and the mirror part are arranged at intervals and are communicated with each other through the spacing area formed between the prism array and the projection lens array, the glue is favorably improved in the glue impressing process, the cavity generated inside the glue is avoided, and the product performance is ensured.
Drawings
Fig. 1 is a schematic view of a projection module according to a first embodiment of the present invention;
FIG. 2 is an enlarged view at A in FIG. 1;
fig. 3 is a schematic view of a projection module according to a second embodiment of the present invention;
FIG. 4 is an enlarged view at B in FIG. 2;
fig. 5 is a schematic diagram of a projection module according to a third embodiment of the present invention;
fig. 6 is a schematic diagram of a process for manufacturing a projection module according to a first embodiment of the present invention;
fig. 7 is a first schematic diagram illustrating a process for manufacturing a projection module according to a second embodiment of the present invention;
fig. 8 is a second schematic diagram illustrating a second process for manufacturing a projection module according to a second embodiment of the present invention;
fig. 9 is a schematic diagram of a projection system of the present invention.
In the figure: 1-substrate one; 2-a prism array; 2-1-prism array one; 2-2-prism array two; 2-3-prism array three; 3-a support; a 4-spacer region; 5-projection lens array; 5-1-a first layer of projection lens array; 5-2-a second layer of projection lens array; 6-substrate two; 7-a projection source; 8-field lens array; 9-a spacer portion; 10-mirror portion; 11-interfacial region one; 12-interfacial region two; 13-a prism array mold; 13-1-prism array mold one; 13-2, a second prism array mould; 100-a projection module; 200-light source.
The specific implementation mode is as follows:
the present invention will be further explained with reference to the accompanying drawings.
As shown in fig. 1 and 2, the utility model discloses a projection module based on microlens array, include field lens array 8, projection source 7, projection lens array 5, prism array 2 that arrange in proper order along light propagation direction, prism array 2 solidifies on one side surface of basement 1, and projection lens array 5 solidifies on one side surface of basement two 6, and projection source 7 solidifies on another side surface that basement two 6 are relative with projection lens array 5, and field lens array 8 solidifies on projection source 7. The first substrate 1 is a single-layer glass plate or a plurality of glass plates which are bonded together, and the second substrate 2 is a single-layer glass plate.
A spacing region 4 is formed between the prism array 2 and the projection lens array 5, vacuum or gas filling is arranged in the spacing region 4, the surface of the prism array 2 is divided into a spacing part 9 and a mirror part 10, the spacing part 9 and the mirror part 10 are arranged at intervals and are mutually communicated through the spacing region 4, the spacing part 9 is parallel to the surface of the substrate 1, the mirror part 10 forms a certain included angle alpha with the surface of the substrate 1, the distance from the spacing part 9 to the surface of the substrate 1 is d1, and the distance from the mirror part 10 to the surface of the substrate 1 is d2.
The projection module further comprises a support 3 arranged between the first substrate 1 and the second substrate 6, the support 3 being used to fix the first substrate 1 and the second substrate 6 and to isolate the spacer 4 from the outside air.
The prism array is divided into M layers along the light propagation direction, M is a positive integer larger than or equal to 1, when M is larger than 1, the M layers of prism arrays are made of different materials, contact interfaces of every two adjacent layers of prism arrays form a first interface area 11 and a second interface area 12 which are alternately arranged, the first interface area 11 corresponds to the spacing part 9 and is parallel to the surface of the first substrate 1, and the second interface area 12 corresponds to the mirror part 10 and forms a certain included angle beta with the surface of the first substrate 1. The multilayer prism arrays made of different materials have different refractive indexes and abbe numbers, so that the deflection angles of different colors of light rays are the same or the difference is small enough that projection patterns at different angles do not show chromatic aberration under the irradiation of a composite light source (such as white light).
In one embodiment, the prism array is a layer. As shown in fig. 3 and 4, in the second embodiment, the prism array 2 is divided into two layers along the light propagation direction, i.e., the prism array two 2-2 and the prism array one 2-1, the distance from the first interface region 11 to the surface of the first substrate 1 is d3, and the distance from the second interface region 12 to the surface of the first substrate 1 is d4. As shown in fig. 5, in the third embodiment, the prism array 2 is divided into three layers along the light propagation direction, which are the prism array three 2-3, the prism array two 2-2, and the prism array one 2-1.
The projection lens array is divided into N layers along the light propagation direction, where N is a positive integer greater than or equal to 1. In the third embodiment, the projection lens array has two layers. When N is larger than 1, the N layers of projection lens arrays are made of different materials, and at least one side of the two side types of each layer of projection lens array is an optical surface type except a plane. The multilayer projection lens has the function that the focal lengths of the light rays with different colors are the same or the difference is small enough that projection patterns with different distances do not show chromatic aberration under the irradiation of a composite light source (such as white light).
As shown in fig. 1 and 3, the projection lens array 5 is a layer, a side surface of the projection lens array 5 contacting the second substrate 6 is a plane, and a side surface of the projection lens array 5 contacting the spacer 4 is a convex.
As shown in fig. 5, the projection lens array 5 is divided into a first layer projection lens array 5-1 and a second layer projection lens array 5-2 along the light propagation direction, a side surface of the first layer projection lens array 5-1 contacting with the second substrate 6 is a plane surface, a side surface of the first layer projection lens array 5-1 contacting with the second layer projection lens array 5-2 is an aspheric surface, and a side surface of the second layer projection lens array 5-2 contacting with the spacer 4 is an aspheric surface. In the third embodiment, a side surface of the first layer of projection lens array 5-1 contacting the second layer of projection lens array 5-2 is convex, a side surface of the second layer of projection lens array 5-2 contacting the first layer of projection lens array 5-1 is concave, and a side surface of the second layer of projection lens array 5-2 contacting the spacer 4 is convex.
The preparation process of the projection module comprises the following steps: curing and molding the prism array on one side surface of the substrate through the imprinting glue, curing and molding the projection lens array on the surface of one side of the substrate through the imprinting glue, curing and molding the projection source on the other side of the substrate, which is opposite to the projection lens array, through the optical coating and the semiconductor etching, and curing and molding the field lens array on the surface of the projection source through the imprinting glue;
as shown in fig. 6, the process of curing and molding the imprinting glue of the prism array 2 includes:
preparing a prism array mold 13 with a profile contour matched with the surface of the prism array 2;
placing the prism array mold 13 above the first substrate 1, filling glue into an area formed between the profiling outline of the prism array mold 13 and the first substrate 1, and forming a prism array 2 after the glue is cured;
the prism array mold 13 is removed.
In the glue filling process, the spacing parts 9 and the mirror surface parts 10 on the surface of the prism array 2 are arranged at intervals and are communicated with each other through the spacing regions 4, so that the glue can flow along the profiling contour of the prism array mold 13 and can be filled in the whole glue filling area, the inner part of the glue is prevented from generating a cavity, and the product performance is ensured.
For the preparation process, when the prism array is divided into two or more layers, the imprinting glue curing and forming process of the prism array comprises the following steps:
preparing prism array molds, wherein the number of the prism array molds is the same as the number of the prism array layers, each prism array mold corresponds to one layer of prism array and is provided with a profiling contour matched with the contact interface of two adjacent layers of prism arrays;
filling glue into an area formed between the profiling outline of the prism array mold and the first substrate above the first substrate of the prism array mold, and forming a layer of prism array after the glue is cured;
taking away the previous prism array mold, placing the other prism array mold above the previous layer of prism array, and filling glue into an area formed between the profiling contour of the prism array mold and the previous layer of prism array; and after the glue is cured, forming another layer of prism array, and repeating the step to form the prism array with the preset number of layers.
As shown in fig. 7 and 8, taking the curing and molding process of the imprinting glue of the two-layer prism array in the second embodiment as an example:
the prism array 2 is divided into two layers along the light propagation direction, namely a prism array II 2-2 and a prism array I2-1, a prism array mold I13-1 and a prism array mold II 13-2 are prepared, the prism array mold I13-1 has a profile contour matched with the contact interface of the prism array II 2-2 and the prism array I2-1, and the prism array mold II 13-2 has a profile contour matched with the surface of the prism array 2;
placing the first prism array mold 13-1 above the first substrate 1, filling glue into an area formed between the profiling outline of the first prism array mold 13-1 and the first substrate 1, and forming a first prism array 2-1 after the glue is cured;
and taking the first prism array mold 13-1 away, placing the second prism array mold 13-2 above the first prism array 2-1, filling glue into an area formed between the profile modeling outline of the second prism array mold 13-2 and the first prism array 2-1, and forming the second prism array 2-2 after the glue is cured.
As shown in fig. 9, a projection system of the present invention includes a light source 200 and a plurality of the projection modules 100. The prism array 2 of the projection module 100 may adopt a single-layer structure of the first embodiment, or a double-layer structure of the second embodiment, and the projection lens array may adopt a single-layer structure, or a double-layer structure.
Wherein, the optical parameters of the plurality of projection modules 100 are the same or different, and the optical parameters include: the focal length of the field lens array, the focal length of the projection lens array, the distance from the field lens array to the projection lens array, the distance from the projection lens array to the projection source, and the included angle formed by the mirror surface part of the prism array and the surface of the first substrate.
When different optical parameters are adopted, the projection distance and the projection angle of the projection area of each projection module 100 are different, and the projections with different angles and different distances can be spliced into a pattern with a larger angle and a wider range.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (8)
1. The utility model provides a projection module based on microlens array, includes field lens array, projection source, projection lens array, the prism array that arranges in proper order along light propagation direction, its characterized in that: the prism array is solidified on one side surface of the first substrate, the projection lens array is solidified on one side surface of the second substrate, a spacing area is formed between the prism array and the projection lens array, vacuum or filled gas is filled in the spacing area, the prism array surface is divided into a spacing part and a mirror part, the spacing part and the mirror part are arranged at intervals and are mutually communicated through the spacing area, the spacing part is parallel to the surface of the first substrate, and a certain included angle is formed between the mirror part and the surface of the first substrate;
the prism array is divided into M layers along the light propagation direction, M is a positive integer greater than or equal to 1, when M is greater than 1, the M layers of prism arrays are made of different materials, contact interfaces of every two adjacent layers of prism arrays form a first interface area and a second interface area which are alternately arranged, the first interface area corresponds to a spacing part and is parallel to the surface of the first substrate, and the second interface area corresponds to a mirror part and forms a certain included angle with the surface of the first substrate;
the projection lens array is divided into N layers along the light propagation direction, N is a positive integer greater than or equal to 1, when N is greater than 1, the N layers of projection lens arrays are made of different materials, and at least one side of the two side types of each layer of projection lens array is an optical surface type except for a plane.
2. A microlens array based projection module as claimed in claim 1, wherein: the prism array is divided into two or more layers along the light propagation direction.
3. A microlens array based projection module as claimed in claim 1, wherein: the projection lens array is divided into a first layer of projection lens array and a second layer of projection lens array along the light propagation direction, one side surface of the first layer of projection lens array, which is in contact with the substrate, is a plane surface, one side surface of the first layer of projection lens array, which is in contact with the second layer of projection lens array, is an aspheric surface, and one side surface of the second layer of projection lens array, which is in contact with the spacer area, is an aspheric surface.
4. A microlens array based projection module as claimed in claim 1, wherein: the projection lens array is solidified on one side surface of the second substrate, the projection source is solidified on the other side surface of the second substrate opposite to the projection lens array, and the field lens array is solidified on the projection source.
5. A microlens array based projection module as claimed in claim 1, wherein: and a support is arranged between the first substrate and the second substrate and is used for fixing the first substrate and the second substrate and isolating the interval area from the external air.
6. A microlens array based projection module as claimed in claim 1, wherein: the first substrate is a single-layer glass plate or a plurality of glass plates which are bonded together, and the second substrate is a single-layer glass plate.
7. A projection system comprising a light source and a plurality of projection modules as claimed in claim 1.
8. A projection system according to claim 7, wherein: optical parameters of the plurality of projection modules are the same or different, the optical parameters including: the focal length of the field lens array, the focal length of the projection lens array, the distance from the field lens array to the projection lens array, the distance from the projection lens array to the projection source, and the included angle formed by the mirror surface part of the prism array and the surface of the first substrate.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202221432347.XU CN217718230U (en) | 2022-06-09 | 2022-06-09 | Projection module based on micro-lens array and projection system |
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| CN202221432347.XU CN217718230U (en) | 2022-06-09 | 2022-06-09 | Projection module based on micro-lens array and projection system |
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| CN217718230U true CN217718230U (en) | 2022-11-01 |
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| CN202221432347.XU Active CN217718230U (en) | 2022-06-09 | 2022-06-09 | Projection module based on micro-lens array and projection system |
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